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diff --git a/web/core/modules/system/src/Tests/Form/RebuildTest.php b/web/core/modules/system/src/Tests/Form/RebuildTest.php
new file mode 100644
index 000000000..2e138bdfb
--- /dev/null
+++ b/web/core/modules/system/src/Tests/Form/RebuildTest.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace Drupal\system\Tests\Form;
+
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\Url;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\simpletest\WebTestBase;
+use Drupal\field\Entity\FieldStorageConfig;
+
+/**
+ * Tests functionality of \Drupal\Core\Form\FormBuilderInterface::rebuildForm().
+ *
+ * @group Form
+ * @todo Add tests for other aspects of form rebuilding.
+ */
+class RebuildTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'form_test'];
+
+  /**
+   * A user for testing.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $webUser;
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);
+
+    $this->webUser = $this->drupalCreateUser(['access content']);
+    $this->drupalLogin($this->webUser);
+  }
+
+  /**
+   * Tests preservation of values.
+   */
+  public function testRebuildPreservesValues() {
+    $edit = [
+      'checkbox_1_default_off' => TRUE,
+      'checkbox_1_default_on' => FALSE,
+      'text_1' => 'foo',
+    ];
+    $this->drupalPostForm('form-test/form-rebuild-preserve-values', $edit, 'Add more');
+
+    // Verify that initial elements retained their submitted values.
+    $this->assertFieldChecked('edit-checkbox-1-default-off', 'A submitted checked checkbox retained its checked state during a rebuild.');
+    $this->assertNoFieldChecked('edit-checkbox-1-default-on', 'A submitted unchecked checkbox retained its unchecked state during a rebuild.');
+    $this->assertFieldById('edit-text-1', 'foo', 'A textfield retained its submitted value during a rebuild.');
+
+    // Verify that newly added elements were initialized with their default values.
+    $this->assertFieldChecked('edit-checkbox-2-default-on', 'A newly added checkbox was initialized with a default checked state.');
+    $this->assertNoFieldChecked('edit-checkbox-2-default-off', 'A newly added checkbox was initialized with a default unchecked state.');
+    $this->assertFieldById('edit-text-2', 'DEFAULT 2', 'A newly added textfield was initialized with its default value.');
+  }
+
+  /**
+   * Tests that a form's action is retained after an Ajax submission.
+   *
+   * The 'action' attribute of a form should not change after an Ajax submission
+   * followed by a non-Ajax submission, which triggers a validation error.
+   */
+  public function testPreserveFormActionAfterAJAX() {
+    // Create a multi-valued field for 'page' nodes to use for Ajax testing.
+    $field_name = 'field_ajax_test';
+    FieldStorageConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'node',
+      'type' => 'text',
+      'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
+    ])->save();
+    FieldConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'node',
+      'bundle' => 'page',
+    ])->save();
+    entity_get_form_display('node', 'page', 'default')
+      ->setComponent($field_name, ['type' => 'text_textfield'])
+      ->save();
+
+    // Log in a user who can create 'page' nodes.
+    $this->webUser = $this->drupalCreateUser(['create page content']);
+    $this->drupalLogin($this->webUser);
+
+    // Get the form for adding a 'page' node. Submit an "add another item" Ajax
+    // submission and verify it worked by ensuring the updated page has two text
+    // field items in the field for which we just added an item.
+    $this->drupalGet('node/add/page');
+    $this->drupalPostAjaxForm(NULL, [], ['field_ajax_test_add_more' => t('Add another item')], NULL, [], [], 'node-page-form');
+    $this->assert(count($this->xpath('//div[contains(@class, "field--name-field-ajax-test")]//input[@type="text"]')) == 2, 'AJAX submission succeeded.');
+
+    // Submit the form with the non-Ajax "Save" button, leaving the title field
+    // blank to trigger a validation error, and ensure that a validation error
+    // occurred, because this test is for testing what happens when a form is
+    // re-rendered without being re-built, which is what happens when there's
+    // a validation error.
+    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->assertText('Title field is required.', 'Non-AJAX submission correctly triggered a validation error.');
+
+    // Ensure that the form contains two items in the multi-valued field, so we
+    // know we're testing a form that was correctly retrieved from cache.
+    $this->assert(count($this->xpath('//form[contains(@id, "node-page-form")]//div[contains(@class, "js-form-item-field-ajax-test")]//input[@type="text"]')) == 2, 'Form retained its state from cache.');
+
+    // Ensure that the form's action is correct.
+    $forms = $this->xpath('//form[contains(@class, "node-page-form")]');
+    $this->assertEqual(1, count($forms));
+    // Strip query params off the action before asserting.
+    $url = parse_url($forms[0]['action'])['path'];
+    $this->assertEqual(Url::fromRoute('node.add', ['node_type' => 'page'])->toString(), $url);
+  }
+
+}